I just had Vihn54 put a 95cri / 4000k Oslon in my HDS. It throws like the 120 lumen Osram but obviously with a much higher cri. It has a very beautiful, natural tint which is consistent across the beam. No rings or other color distortions. It's only putting out about 100-120 lumens on high which is what I expected. It seems to keep it's temperature at lower levels quite well.
I would say it compares well with a 4000k Nichia 219 but at least in the HDS there are no rings with the Osram and while probably subjective, I think it produces slightly better colors. I would say that anyone wanting to upgrade their hds with a Nichia would be better off with the Oslon. The beam is tighter, cleaner, higher cri, and the output appears the same, though the differences are minute.